An on-site treatment system for sedimentable matter in urban drainage

Abstract

The present disclosure provides an on-site treatment system for sediments in urban drainage, including an interception device, a collection and disposal device and an early warning device. The interception device is arranged in an interception well for the deposition of particles in rainwater; the collection and disposal device is arranged outside the interception well for the disposal of sediments in the interception well; the early warning device includes a sediment probe, which is arranged in the interception well. When the sediment probe detects that the sediment concentration reaches a set threshold, the collection and disposal device is activated. The present disclosure integrates interception, removal, filtration and disposal, and can quickly remove sludge inside the interception well, reducing the impact of urban non-point source pollution on the environment.

Description

Technical Field

[0001] The present disclosure relates to the field of urban drainage treatment, and in particular to an on-site treatment system suitable for sediments in urban drainage. Background Art

[0002] With the rapid economic development and the accelerating urbanization process, the urban surface hardening layer is increasing. During the rainfall, a large amount of surface runoff will be collected in the collection wells and discharged into the urban rivers. Due to the leakage of pollutants from various sources such as urban production and life, as well as atmospheric deposition, there will be a large number of toxic and harmful pollutants on the surface. These pollutants accumulated on the surface are washed away by runoff, dissolved in water, and adsorbed on the surface of sediment. Therefore, rainwater will carry a large amount of pollutants into the urban pipelines. If not effectively controlled, they will directly enter the urban surface water bodies, seriously affecting the water quality, which is one of the important reasons for the formation of black and smelly water bodies.

[0003] At present, the response measures for initial rainwater pollution mainly use interception wells and abandonment wells to intercept initial rainwater and mixed sewage and introduce them into the municipal pipe network. However, in this process, rainwater will carry a large amount of sediment into the pipes, interception wells and abandonment wells. As the rainfall time increases, the later rainwater continues to enter the urban pipe network, interception wells and abandonment wells. The high-speed water flow will stir the sediment and carry it to the downstream of the pipe, and eventually it will inevitably be discharged into the urban water body. The existing interception wells and abandonment wells have weak precipitation and interception capabilities for particulate matter such as sediment. The precipitable matter in the rainwater is discharged into the urban surface water body, which will aggravate the deterioration of environmental water quality. In addition, if the sediment in the interception wells and abandonment wells cannot be removed in time, it may cause the drainage pipes to be blocked, and in severe cases it may even affect the city's flood discharge.

[0004] In response to the above problems, the mainstream rainwater interception measure on the market is to use a basket-type sedimentation device, which is generally used in rainwater collection pipes. The presence of the filter is prone to blockage, affecting the safety of urban flood discharge, and cannot meet the needs of existing urban interception wells and abandoned wells. Therefore, it is urgent to develop a particle interception device that is suitable for existing large-scale urban interception wells and abandoned wells, with reliable technology and easy installation, and can dispose of the intercepted sediments in a timely manner. Summary of the invention

[0005] In order to solve at least one of the above technical problems, the present disclosure provides an on-site treatment system for sedimentable matter in urban drainage, which can effectively control the large amount of sedimentable matter carried by drainage from entering rivers and lakes while ensuring flood safety.

[0006] According to one aspect of the present disclosure, a system for on-site treatment of sedimentable matter in urban drainage includes an interception device, a collection and disposal device, and an early warning device. The interception device is arranged in an interception well and is used for the deposition of particulate matter in rainwater; the collection and disposal device is arranged outside the interception well and is used for disposing of sediments in the interception well; the early warning device includes a sediment probe, which is arranged in the interception well. When the sediment probe detects that the sediment concentration reaches a set threshold, the collection and disposal device is started.

[0007] According to at least one embodiment of the present disclosure, the interception device includes a first arc-shaped blocking baffle and a side baffle. The first arc-shaped blocking baffle is arranged in the interception well. The first arc-shaped blocking baffle is arranged close to the water inlet of the interception well with the arc-shaped surface facing the water inlet. The two side baffles are respectively arranged on both sides of the first arc-shaped blocking baffle to form a U-shaped structure.

[0008] According to at least one embodiment of the present disclosure, the interception device further comprises a second arc-shaped blocking baffle, which is disposed in the interception well and is disposed close to a water outlet of the interception well with its arc-shaped surface facing away from the water outlet.

[0009] According to at least one embodiment of the present disclosure, the angle between the second arc-shaped baffle plate and the bottom of the intercepting well is 60° to 90°.

[0010] According to at least one embodiment of the present disclosure, the interception device further includes a mud discharge slope, and the mud discharge slope is arranged at the bottom of the interception well.

[0011] According to at least one embodiment of the present disclosure, the system further includes a mud collecting funnel area, which is arranged at the bottom end of the mud discharge slope, and the sediment probe is arranged in the mud collecting funnel area. The early warning device further includes a control module, and the sediment probe is electrically connected to the control module.

[0012] According to at least one embodiment of the present disclosure, the collection and disposal device includes a sludge conveying pipe, a sludge pump, a dehydration unit, a purification and disposal unit, a dried sludge collection tank, a power unit and a control switch, one end of the sludge conveying pipe is arranged in the interception well, and the other end of the sludge conveying pipe is connected to the dehydration unit, the sludge pump is arranged on the sludge conveying pipe, the dehydration unit is provided with a water outlet and a material outlet, the water outlet is connected to the purification and disposal unit, and the material outlet is connected to the dried sludge collection tank, the purification and disposal unit is provided with activated carbon and zeolite, the power unit provides power to the dehydration unit and the sludge pump respectively, and the control switch is connected to the power unit and the sludge pump respectively.

[0013] According to at least one embodiment of the present disclosure, the collection and disposal device also includes a dosing device, which includes a stirring box provided with an agitator and a dosing box provided with a flocculant, the stirring box is arranged on the sludge conveying pipe between the sludge pump and the dehydration unit, and the dosing box is connected to the stirring box.

[0014] According to at least one embodiment of the present disclosure, the collection and disposal device also includes a filter, which includes a filter body, a filter screen and a chute, the filter screen is arranged in the filter body, the chute is arranged at the bottom of the filter body, one end of the chute is against the filter screen, and the other end of the chute is against an inner wall of the filter body.

[0015] According to at least one embodiment of the present disclosure, the dehydration unit includes a double-screw interactive extrusion device, and the power unit includes an engine and a reducer. The engine is connected to the double-screw interactive extrusion device through the reducer, and the engine is connected to the sludge pump through a belt.

[0016] After adopting the above technical solution, the present disclosure has the following advantages:

[0017] 1) The present invention combines the characteristics of existing abandoned wells in cities and adopts an arc-shaped baffle to improve the rapid reduction of sediment kinetic energy under rainfall conditions, improve sediment sedimentation, and further combine sludge extraction, filtration and disposal methods to achieve efficient interception and removal of sediments, thereby reducing the impact of urban non-point source pollution on surface water bodies;

[0018] 2) The design of the sloped mud discharge slope and the edge dead water area can quickly collect the sediment after sedimentation and avoid it being stirred by the water flow;

[0019] 3) Fully consider the organic and other pollutants in urban roads, and remove tail water pollutants by using filtering devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings illustrate exemplary embodiments of the present disclosure and together with the description serve to explain the principles of the present disclosure. These drawings are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this specification.

[0021] Figure 1 A schematic plan view of an internal interception device of an interception well according to an embodiment of the present disclosure;

[0022] Figure 2 A schematic cross-sectional view of a retention device in an interception well according to an embodiment of the present disclosure taken along the line BB';

[0023] Figure 3 A schematic cross-sectional view of the interception device of the interception well according to the embodiment of the present disclosure;

[0024] Figure 4 An internal top view of a collection and disposal device according to an embodiment of the present disclosure;

[0025] Figure 5 A schematic diagram of an external side view of a mobile vehicle according to an embodiment of the present disclosure;

[0026] Figure 6 A side view of the interior of a filter according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0027] The present disclosure is further described in detail below in conjunction with the accompanying drawings and implementations. It is understood that the specific implementations described herein are only used to explain the relevant content, rather than to limit the present disclosure. It should also be noted that, for ease of description, only the parts related to the present disclosure are shown in the accompanying drawings.

[0028] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in the present disclosure may be combined with each other. The present disclosure will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0029] like Figure 1 As shown, the present disclosure selects a retention well (abandoned flow well) in a southern city for demonstration. The diameter of the water inlet pipe of the abandonment flow well 100 is 2.2m, and the entire length of the abandonment flow well is 6m. It is divided into two parts by a weir plate type adjustable weir 200, and a lever arm 300 for controlling the weir plate is arranged near the water inlet.

[0030] like Figures 1 to 4 As shown, the embodiment of the present disclosure provides an on-site treatment system for sedimentable matter in urban drainage, including a retention device 1, a collection and disposal device 2 and an early warning device 3. The retention device 1 is arranged in an interception well for the deposition of particles in rainwater; the collection and disposal device 2 is arranged outside the interception well for the disposal of sediments in the interception well; Figure 3 As shown, the early warning device 3 includes a sediment probe 31, which is arranged in the interception well. When the sediment probe 31 detects that the sediment concentration reaches a set threshold value (the silt concentration is 1.0 g / L), the collection and disposal device 2 is started.

[0031] According to at least one embodiment of the present disclosure, Figure 2 and Figure 3 As shown, the interception device 1 includes a first arc-shaped blocking baffle 11, a side baffle 12, a second arc-shaped blocking baffle 13 and a mud discharge slope 14. The first arc-shaped blocking baffle 11 is arranged in the intercepting well. The first arc-shaped blocking baffle 11 is arranged close to the water inlet of the intercepting well and the arc-shaped surface faces the water inlet. The two side baffles 12 are respectively arranged on both sides of the first arc-shaped blocking baffle 12 to form a U-shaped connecting structure; the U-shaped structure is arranged on the inner side of the force arm 200. Figure 2 The arrow direction is the direction of water flow. The second arc-shaped baffle 13 is arranged in the interception well, the second arc-shaped baffle is arranged near the outlet of the interception well and the arc surface is facing away from the outlet. The two ends and the bottom of the second arc-shaped baffle are fixed to the side wall and the bottom of the waste well to strengthen the removal of sediment. The angle between the second arc-shaped baffle and the bottom of the interception well is 60°-90°. Preferably, the angle between the second arc-shaped baffle and the bottom of the interception well is 85°. The mud discharge slope 14 is arranged at the bottom of the interception well, and the inclination angle of the slope is 5°-15°, preferably 15°. The two side baffles 12 are connected to the mud discharge slope 14 through pillars 15. When the rainfall will reach 65mm within 6 hours, water samples are collected from the water inlet and outlet. After filtering the membrane, the filter membrane and the intercepted material are weighed and compared, and it is found that the particle removal rate reaches 84.6%. The tops of the first arc-shaped blocking baffle 11 and the second arc-shaped blocking baffle 13 are sawtooth overflow ports 16, which can effectively intercept scum.

[0032] The mud discharge slope 14 is arranged at the bottom between the two lever arms of the intercepting well (abandoning well), and is in the form of a triangular slope. The height range of one side of the slope can be within 0.3m-1.0m. At the same time, the mud discharge slope 14 can be used as a base to fix the first arc-shaped blocking baffle 11; side baffles are arranged on both sides of the inside of the lever arm, and the side baffles are connected to the mud discharge slope pillars at the bottom, and are closed and connected to the first arc-shaped blocking baffle 11 to prevent the water flow from hitting the first arc-shaped blocking baffle and then flowing away through the lever arm activity space when it is diverted to both sides along the arc; and a dead water area can be formed in the lever arm activity space to avoid disturbance during the mud collection process.

[0033] According to at least one embodiment of the present disclosure, Figure 3 As shown, the system also includes a mud collecting funnel area 4, which is arranged at the bottom end of the mud discharge slope 14 to facilitate the centralized collection of sediment (silt); the sediment probe 31 is arranged in the mud collecting funnel area, and the early warning device 3 also includes a control module 32, and the sediment probe 31 is electrically connected to the control module 32.

[0034] According to at least one embodiment of the present disclosure, Figure 4As shown, the collection and disposal device 2 includes a sludge conveying pipe 21, a sludge pump 22, a dehydration unit 23, a purification disposal unit 24, a dried sludge collecting tank 25, a power unit 26 and a control switch 27. One end of the sludge conveying pipe 21 is arranged in the interception well, and the other end of the sludge conveying pipe 21 is connected to the dehydration unit 23. The sludge pump 22 is arranged on the sludge conveying pipe 21. The dehydration unit 23 is provided with a water outlet and a discharge port. The water outlet is connected to the purification disposal unit 24, and the discharge port is connected to the dried sludge collecting tank 25. The purification disposal unit 24 is provided with activated carbon and zeolite. The power unit 26 provides power to the dehydration unit 23 and the sludge pump 22 respectively. The control switch 27 is connected to the power unit 26 and the sludge pump 22 respectively, and the control module 32 is electrically connected to the control switch 27.

[0035] For ease of use, such as Figure 5 As shown, the collection and disposal device 2 can be fixed on a mobile vehicle, and the mobile vehicle includes wheels 400 and a base 500 , the two wheels 400 are installed below the base 500 , and the collection and disposal device 2 is installed above the base 500 .

[0036] According to at least one embodiment of the present disclosure, the collection and disposal device 2 also includes a dosing device 28, which includes a stirring box 281 provided with an agitator and a dosing box 282 provided with a flocculant, the stirring box 281 is arranged on the sludge conveying pipe between the sludge pump and the dehydration unit, and the dosing box 282 is connected to the stirring box 281. The dosing device 28 is mainly used to thicken the extracted sludge to facilitate subsequent effective dehydration.

[0037] According to at least one embodiment of the present disclosure, the collection and disposal device 2 further includes a filter 29, such as Figure 6 As shown, the filter 29 includes a filter body 291, a filter screen 292, a chute 293 and a handle 294. The filter screen 292 is arranged in the filter body 291, and the chute 293 is arranged at the bottom of the filter body 291. One end of the chute 293 is against the filter screen 292, and the other end of the chute 293 is against an inner wall of the filter body 291. The chute 293 ensures that the filter screen 292 is reduced in accumulation and clogging during the filtering process.

[0038] According to at least one embodiment of the present disclosure, the dehydration unit 23 includes a double-screw inter-extrusion device, the power unit 26 includes an engine 261 and a reducer 262, the engine 261 is connected to the double-screw inter-extrusion device through the reducer 262, and the engine 261 is connected to the sludge pump 22 through a belt. Preferably, the engine 261 is a diesel engine.

[0039] When using the present invention, the sludge conveying pipe 21 is inserted into the sludge collecting funnel area 4 in the interception well (abandonment well). When the sediment probe 31 in the sludge collecting funnel area 4 detects that the sludge concentration is 10g / L, the control module 32 automatically turns on the control switch 27 in the subsequent collection and disposal device 2. After the diesel engine 261 is operated, the belt drives the sludge pump 22 to suck, and the water-containing sludge enters the filter 29. After filtering, large particles of sand and gravel and other materials are trapped in the filter 29. Under the action of the sludge pump 22, the fine sludge enters the mixing box 281 through the PVC sludge conveying pipe. At this time, the flocculant passes through the sludge pump 22. The dosing box 282 is fed into the mixing box 281 through the conveying pipe, and then enters the dehydration unit 23 after being stirred. The double-screw interactive extrusion device in the dehydration unit 23 rotates under the joint action of the reducer 262, the diesel engine 261 and the rotating shaft, and the sludge entering is squeezed. Under the action of the double-screw interactive extrusion device, the sludge is dehydrated, and the sludge is continuously pushed to the discharge port and enters the dried sludge collection tank 25; the squeezed water enters the modular purification and disposal unit 24 through the water outlet and PVC water delivery. The purification and disposal unit 24 contains activated carbon and zeolite. After removing the pollutants, it is discharged through the drain port. About 85kg of dried sludge is collected. When the dried sludge collection tank 25 is full, the sludge is centrally disposed. When the sediment probe 31 detects that the sludge concentration is 1.0g / L, the control module 32 turns off the control switch 27.

[0040] In the description of this specification, the description with reference to the terms "one embodiment / method", "some embodiments / methods", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment / method or example are included in at least one embodiment / method or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment / method or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments / methods or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments / methods or examples described in this specification and the features of the different embodiments / methods or examples, unless they are contradictory.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0042] Those skilled in the art should understand that the above embodiments are only for the purpose of clearly illustrating the present disclosure, and are not intended to limit the scope of the present disclosure. For those skilled in the art, other changes or modifications may be made based on the above disclosure, and these changes or modifications are still within the scope of the present disclosure.

Claims

1. A system for in-situ treatment of sedimentable matter in urban drainage, characterized in that: It includes an interception device, a collection and disposal device and an early warning device. The interception device is arranged in the interception well and is used for the deposition of particles in rainwater; the collection and disposal device is arranged outside the interception well and is used for the disposal of sediments in the interception well; the early warning device includes a sediment probe, which is arranged in the interception well. When the sediment probe detects that the sediment concentration reaches a set threshold, the collection and disposal device is started; The interception device includes a first arc-shaped blocking baffle and a side baffle, wherein the first arc-shaped blocking baffle is arranged in the interception well, the first arc-shaped blocking baffle is arranged close to the water inlet of the interception well and the arc-shaped surface faces the water inlet, and the two side baffles are respectively arranged on both sides of the first arc-shaped blocking baffle to form a U-shaped structure; The interception device further comprises a second arc-shaped blocking baffle, which is arranged in the interception well, and the second arc-shaped blocking baffle is arranged close to the water outlet of the interception well and the arc-shaped surface faces away from the water outlet; The collection and disposal device includes a sludge conveying pipe, a sludge pump, a dehydration unit, a purification and disposal unit, a dried sludge collecting tank, a power unit and a control switch. One end of the sludge conveying pipe is arranged in the interception well, and the other end of the sludge conveying pipe is connected to the dehydration unit. The sludge pump is arranged on the sludge conveying pipe. The dehydration unit is provided with a water outlet and a material outlet. The water outlet is connected to the purification and disposal unit, and the material outlet is connected to the dried sludge collecting tank. The purification and disposal unit is provided with activated carbon and zeolite. The power unit provides power to the dehydration unit and the sludge pump respectively, and the control switch is connected to the power unit and the sludge pump respectively.

2. The in-situ treatment system according to claim 1, characterized in that: The included angle between the second arc-shaped baffle plate and the bottom of the intercepting well is 60° to 90°.

3. The in-situ treatment system according to claim 1, characterized in that: The interception device also includes a mud discharge slope, which is arranged at the bottom of the interception well.

4. The in-situ treatment system according to claim 3, characterized in that: The system further comprises a mud collecting funnel area, which is arranged at the bottom end of the mud discharge slope, and the sediment probe is arranged in the mud collecting funnel area. The early warning device further comprises a control module, and the sediment probe is electrically connected to the control module.

5. The in-situ treatment system according to claim 1, characterized in that: The collection and disposal device also includes a dosing device, which includes a stirring box with a stirrer and a dosing box with a flocculant. The stirring box is arranged on the sludge conveying pipe between the sludge pump and the dehydration unit, and the dosing box is connected to the stirring box.

6. The in-situ treatment system according to claim 1, characterized in that: The collection and disposal device also includes a filter, which includes a filter body, a filter screen and an inclined slot. The filter screen is arranged in the filter body, and the inclined slot is arranged at the bottom of the filter body. One end of the inclined slot abuts against the filter screen, and the other end of the inclined slot abuts against an inner wall of the filter body.

7. The in-situ treatment system according to claim 1, characterized in that: The dehydration unit includes a double-screw interactive extrusion device, and the power unit includes an engine and a reducer. The engine is connected to the double-screw interactive extrusion device through the reducer, and the engine is connected to the sludge pump through a belt.

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